package com.devshephard.nio.serversocket.normal.server;

import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.ArrayList;
import java.util.List;

import static com.devshephard.nio.util.ByteBufferUtil.debugRead;

@Slf4j
public class ServerSocketChannelDemo {

    public static void main(String[] args) throws IOException {

        // 使用 nio 来理解阻塞模式, 单线程
// 0. ByteBuffer
        ByteBuffer buffer = ByteBuffer.allocate(16);
// 1. 创建了服务器
        ServerSocketChannel ssc = ServerSocketChannel.open();

// 2. 绑定监听端口
        ssc.bind(new InetSocketAddress(8081));

// 3. 连接集合
        List<SocketChannel> channels = new ArrayList<>();
        while (true) {
            // 4. accept 建立与客户端连接， SocketChannel 用来与客户端之间通信
            log.info("connecting...");
            SocketChannel sc = ssc.accept(); // 阻塞方法，线程停止运行
            log.info("connected... {}", sc);
            channels.add(sc);
            for (SocketChannel channel : channels) {
                // 5. 接收客户端发送的数据
                log.info("before read... {}", channel);
                channel.read(buffer); // 阻塞方法，线程停止运行
                buffer.flip();
                debugRead(buffer);
                buffer.clear();
                log.info("after read...{}", channel);
            }
        }

    }

}
